Casio DBC-611G-1 Data Bank Calculator Watch Gold 4971850946502 | eBay
Vintage Casio Databank from the 80s - YouTube
Amazon.com: Casio Multilingual Mens Databank Watch, with 13 Languages and 30 Page Databank, 50M Water Resistant, 5 Multi-Function Alarms, with Stopwatch, and Countdown Timer, Features Hourly Time Signals : Casio: Clothing, Shoes